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Profibus DP, PA(antyfire)

Created by: karolewsky at: 6/21/2012 7:12 AM (3 Replies)

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6/21/2012 7:12 AM	Rate (0)
karolewsky Posts: 26 Rating: (0)	Hi all, I'm wondering about one thing. It's generally said that profibus PA is used in places where the possibility of fire happened is more likely. I wonder how it is possible, I know that Profibus PA sends current as a signal, but anyway in PA and DP there is still the same 5V potential. greets Karol
karolewsky Posts: 26 Rating: (0)
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6/22/2012 8:50 AM	Rate (1)
Rated X Posts: 1547 Rating: (129)	Hi Karol, you can use Profibus PA in areas where fires or explosions would happen more likly, because it is intrinsically safe. This means that there can no sparks be generated, which would inflame the light inflammable area or any gases around. This is possible because the Profibus PA participant gets not only his information over the Profibus cable but also its power (with 15V and 150mA). I hope this was helpful.
Rated X Posts: 1547 Rating: (129)
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This contribution was helpful to 1 thankful Users karolewsky

6/22/2012 11:31 AM	Rate (0)
karolewsky Posts: 26 Rating: (0)	Thanks a lot:) That's quite clear for me now Best regards Karol
karolewsky Posts: 26 Rating: (0)
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6/22/2012 1:18 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/24/2025 Posts: 3042 Rating: (1061)	Allow me to clarify Rated X's statement that "you can use Profibus PA in areas where fires or explosions would happen, because it is intrinsically safe" to make sure it does not lead to confusion and/or the (incorrect) assumption that anything PA is by default intrinsically safe: Profibus PA supports theFISCO model (Fieldbus Intrinsically Safe COncept) and as suchpermits usage in Ex areas. It is however the users responsibilty to ensure correct equipment selection and compliance and NOT all Profibus PA equipment (be it PA Couplers, devices, terminators etc.) is suitable for usage in Ex enviroments (e.g. Siemens has standard PA couplers for usage of PA in non hazardous areas as well asEx rated PA couplers which you'd use if your PA Network extends into a hazardous area). Anyhow, best place to gain an idea how PA works and what to look out for if it is to be usedin potentially explosive areas is the PROFIBUS PA User and Installation Guideline. Additional useful Siemens relevant info can be foundin the SIMATIC Bus links DP/PA coupler, active field distributors, DP/PA Link and Y Link. I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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This contribution was helpful to 1 thankful Users dchartier